Difference between revisions of "Example Color Space"

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Example of how to convert between different color spaces in BoofCV.  Either the whole image can be coverted or individual values.
Example of how to convert between different color spaces in BoofCV.  Either the whole image can be converted or individual values.


Example Code:
Example Code:
* [https://github.com/lessthanoptimal/BoofCV/blob/v0.19/examples/src/boofcv/examples/imageprocessing/ExampleColorSpace.java ExampleColorSpace.java]
* [https://github.com/lessthanoptimal/BoofCV/blob/v0.37/examples/src/main/java/boofcv/examples/imageprocessing/ExampleColorSpace.java ExampleColorSpace.java]


Concepts:
Concepts:
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Relevant Examples:
Relevant Examples:
* [[Example_Color_Segmentation| Color Segmentation]]
* [[Example_Color_Segmentation| Color Segmentation]]
Relevant Applets:
* [[Applet Color Space| Color Space]]


= Example Code =
= Example Code =
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  */
  */
public class ExampleColorSpace {
public class ExampleColorSpace {
 
public static void main( String[] args ) {
public static void main( String args[] ) {
BufferedImage image = UtilImageIO.loadImage(UtilIO.pathExample("sunflowers.jpg"));
BufferedImage image = UtilImageIO.loadImage("../data/applet/sunflowers.jpg");


// Convert input image into a BoofCV RGB image
// Convert input image into a BoofCV RGB image
MultiSpectral<ImageFloat32> rgb = ConvertBufferedImage.convertFromMulti(image, null,true, ImageFloat32.class);
Planar<GrayF32> rgb = ConvertBufferedImage.convertFromPlanar(image, null,true, GrayF32.class);


//---- convert RGB image into different color formats
//---- convert RGB image into different color formats
MultiSpectral<ImageFloat32> hsv = rgb.createSameShape();
Planar<GrayF32> hsv = rgb.createSameShape();
ColorHsv.rgbToHsv_F32(rgb, hsv);
ColorHsv.rgbToHsv(rgb, hsv);


MultiSpectral<ImageFloat32> yuv = rgb.createSameShape();
Planar<GrayF32> yuv = rgb.createSameShape();
ColorYuv.yuvToRgb_F32(rgb, yuv);
ColorYuv.yuvToRgb(rgb, yuv);


//---- Convert individual pixels into different formats
//---- Convert individual pixels into different formats

Revision as of 19:14, 21 December 2020

Example of how to convert between different color spaces in BoofCV. Either the whole image can be converted or individual values.

Example Code:

Concepts:

  • Color space

Relevant Examples:

Example Code

/**
 * Simple demonstration for converting between color spaces in BoofCV. Currently RGB, YUV, HSV, and YCbCr are
 * supported.
 *
 * @author Peter Abeles
 */
public class ExampleColorSpace {
	public static void main( String[] args ) {
		BufferedImage image = UtilImageIO.loadImage(UtilIO.pathExample("sunflowers.jpg"));

		// Convert input image into a BoofCV RGB image
		Planar<GrayF32> rgb = ConvertBufferedImage.convertFromPlanar(image, null,true, GrayF32.class);

		//---- convert RGB image into different color formats
		Planar<GrayF32> hsv = rgb.createSameShape();
		ColorHsv.rgbToHsv(rgb, hsv);

		Planar<GrayF32> yuv = rgb.createSameShape();
		ColorYuv.yuvToRgb(rgb, yuv);

		//---- Convert individual pixels into different formats
		float[] pixelHsv = new float[3];
		ColorHsv.rgbToHsv(10,50.6f,120,pixelHsv);
		System.out.printf("Found RGB->HSV = %5.2f %5.3f %5.1f\n",pixelHsv[0],pixelHsv[1],pixelHsv[2]);

		float[] pixelRgb = new float[3];
		ColorHsv.hsvToRgb(pixelHsv[0],pixelHsv[1],pixelHsv[2],pixelRgb);
		System.out.printf("Found HSV->RGB = %5.1f %5.1f %5.1f expected 10 50.6 120\n",
				pixelRgb[0],pixelRgb[1],pixelRgb[2]);

		float[] pixelYuv = new float[3];
		ColorYuv.rgbToYuv(10,50.6f,120,pixelYuv);
		System.out.printf("Found RGB->YUV = %5.1f %5.1f %5.1f\n",pixelYuv[0],pixelYuv[1],pixelYuv[2]);

		ColorYuv.yuvToRgb(pixelYuv[0],pixelYuv[1],pixelYuv[2],pixelRgb);
		System.out.printf("Found YUV->RGB = %5.1f %5.1f %5.1f expected 10 50.6 120\n",
				pixelRgb[0],pixelRgb[1],pixelRgb[2]);
	}
}